嗨carrie4ia，

Hi carrie4ia,

感谢您在此发帖。

对于您的问题，您是否可以提供Windows系统的版本？ Win7还是Windows服务器？ Microsoft提供了不同的KB以在.net框架3.5中使用TLS1.2。

For your question, could you provide the version of your windows system? Win7 or Windows server? Microsoft provide different KB to use TLS1.2 in .net framework 3.5.

KB3154​​518 功能;  可靠性汇总HR-1605 - NDP 2.0 SP2 - Win7 SP1 / Win 2008 R2 SP1

KB3154518    Reliability Rollup HR-1605 - NDP 2.0 SP2 - Win7 SP1/Win 2008 R2 SP1

KB3154​​519 功能;  可靠性汇总HR-1605 - NDP 2.0 SP2 - Win8 RTM / Win 2012 RTM

KB3154519    Reliability Rollup HR-1605 - NDP 2.0 SP2 - Win8 RTM/Win 2012 RTM

KB3154​​520 功能;  可靠性汇总HR-1605 - NDP 2.0 SP2 - Win8.1RTM / Win 2012 R2 RTM

KB3154520    Reliability Rollup HR-1605 - NDP 2.0 SP2 - Win8.1RTM/Win 2012 R2 RTM

KB3156421 功能;   1605 HotFix汇总通过适用于Windows 10的Windows Update。

KB3156421    1605 HotFix Rollup through Windows Update for Windows 10.

我将在Visual Studio 2010上进行测试并明天提供反馈。

I will do the test on Visual Studio 2010 and feedback tomorrow.

最诚挚的问候，

Wendy